1. To make one's way through something or some place with unsteady or faltering steps. I could tell by the way he was stumbling through the bar that he'd had too much to drink. The woman was stumbling through the streets muttering to herself. I stumbled through the hallway half asleep looking for the bathroom.

2. To progress through some performance or recitation with great difficulty or in an awkward, faltering manner. We both forgot our lines, so we just stumbled through the scene as best we could. He stumbled a bit through the middle of his speech, but overall it went pretty well.